Gender Studies: Why is this?

I have noticed when male and female babies get born they are both equal in size and strenght, you see no difference between a male and female (except genitalia) same goes on with boy and girl toddlers and prepubercent children but then when puberty starts there begins the difference with height, strenght and voice,... show more I have noticed when male and female babies get born they are both equal in size and strenght, you see no difference between a male and female (except genitalia) same goes on with boy and girl toddlers and prepubercent children but then when puberty starts there begins the difference with height, strenght and voice, the boys get taller, stronger and their voice changes but girls stay shorter and weaker most of the time, then you have adult men and women, you can clearly see the difference but then as they age they begin to be similair again like before puberty, elderly men become weak again, smaller in size and are equal as elderly women, their voices are high pitched again and now men and women are again equally the same as before puberty and when they were babies. Why is this? Nature surely is a strange thing.
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